ANSI C and comment preprocessing
Henry Spencer
henry at zoo.toronto.edu
Fri Jan 18 10:31:06 AEST 1991
In article <3303 at unisoft.UUCP> greywolf at unisoft.UUCP (The Grey Wolf) writes:
>If comments are expanded to spaces, this kind of breaks things like
>
>#define operate_with(x) \
> dbm_put(p->pw_/**/e); \
> munge_data(p->pw_/**/e, munge_factor[1]); \
> login->pw_/**/e = p->pw_/**/e;
>
>doesn't it?
This macro is already broken; even before ANSI C, there were many C compilers
that wouldn't do what you're expecting with it.
>How does ANSI token-pasting work? (DON'T say RTFM because I don't *have*
>TFM!) Is is something similar to what I've provided above as an example?
No. This revolting kludge has been flushed, in favor of a language feature
that doesn't rely so heavily on implementation accidents. "##" is the
ANSI C token-concatenation operator.
--
If the Space Shuttle was the answer, | Henry Spencer at U of Toronto Zoology
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